Let's see... this is NOT what will be going to the article. I'm just saying what I know.
The DS has an audio chip which have 16 different channels (in the SNES sense, i.e. when it's playing synthesised music, one instrument/effect will take up one sound channels, however, you can also just decide to stream audio from the cart - especially with games with larger cart sizes. The audio chip will mix them)
, no audio sample interpolation, supports effects such as echo, filter, etc
-Stereo sound supported, 2 speakers on DS, headphones output.
-Virtual surround in some games.
-The DSi can officially play AAC files just fine.
-Homebrew opens access to various music/audio file types.
-There are games that use streamed audio
-ADPCM, PCM 8, PCM 16 supported, there's also audio codecs
-All 16 channels can be used for ADPCM, PCM 8 and PCM 16, last 8 channels can be also used as PSG - 6 are square wave while 2 are white noise channels.
-Microphone and microphone jack
It still needs some revising and fact checks.

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